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Isaac Howard, 5, plays in a water feature during a visit with his family to the splash pad at Elver Park in Madison, Wis., on July 21, 2016. The high pressure system, sometimes called a "heat dome," will push conditions to their hottest point so far this summer, though record hot temperatures are not expected, according to the National Weather Service.<span style="color: Red;">*</span> John Hart, AP
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The national weather map showed heat alerts in much of the central U.S. along with portions of the East and West coasts.(Photo: National Weather Service)
For the first time in at least a decade, portions<span style="color: Red;">*</span>of the nation's three largest metro areas —<span style="color: Red;">*</span>New York, Los Angeles and Chicago — were all under heat wave alerts Friday morning.
Daryl Herzmann, a scientist at Iowa State University, said reliable records for such data only go back to October 2005, meaning the last time all three were under such an alert could go back much farther.
Other big cities such as Philadelphia, St. Louis, Kansas City, Mo., Phoenix<span style="color: Red;">*</span>and Minneapolis were also under heat watches, warnings<span style="color: Red;">*</span>or advisories. Washington, D.C., could join that list later Friday or Saturday.
In all, 122 million Americans in 26 states were under heat alerts, according to the National Weather Service.
Temperatures will approach or surpass 100 degrees over a large area Friday, the weather service said. The hot weather<span style="color: Red;">*</span>will combine with an extremely humid air mass to result in dangerous heat indices well above<span style="color: Red;">*</span>100 degrees and even as high as 115 degrees for some areas.
In Chicago, the weather service said temperatures and moisture this high could lead to heat-related illnesses. The elderly, small children and pets are especially susceptible.
Even though humidity was low in<span style="color: Red;">*</span>the Los Angeles area, the weather service warned that dangerous heat-related illness is possible, especially for sensitive populations, those conducting outdoor activities<span style="color: Red;">*</span>and people without access to air conditioning.
The central and eastern heat wave is courtesy of a large area of high pressure at the middle and upper levels of the atmosphere, the weather service said. Air sinks under high pressure, preventing clouds and precipitation from forming.
The hot temperatures will continue across the central U.S. while expanding east for the weekend, with temperatures
in the mid-90s expected for the Mid-Atlantic and Northeast on Saturday and Sunday.
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